add demo volume code

demo/volume/include/main.h

@@ -0,0 +1,23 @@
+/*
+ * ALGO     : PROJ. : Volume
+ * RESEARCH : File  : main.h
+ *          : Date  : 20100531.0725UTC
+ *          : Email : mail@algoresearch.net
+ */
+
+#include <pthread.h>
+
+typedef struct{
+    pthread_t pid_observer, pid_display, pid_event_loop;
+
+    int *space_i, *space_o;
+    unsigned int space_w, space_h, space_d, size_plane, size_space;
+    int dw, dh;
+
+    int a_sync, motion, mx, my;
+    float ax, ay, c_ax, c_ay;
+
+    int main, mapping, display;
+    unsigned int iter;
+}SYS_TABLE;
+